Planetary gear transmission systems or components – Planet periphery surrounds axis of interacting gear
Patent
1994-09-14
1996-04-23
Ta, Khoi Q.
Planetary gear transmission systems or components
Planet periphery surrounds axis of interacting gear
475178, 475168, F16H 132
Patent
active
055098614
DESCRIPTION:
BRIEF SUMMARY
This invention is directed at an improved form of mechanical speed reducer comprising an array of pins located in a gyrating carrier body that engage and disengage intermittently with a geared member to provide large ratio speed reduction at high operating efficiency.
From one aspect the invention consists in a motion transmitting device including a housing structure comprising gear means attached to an output shaft; a carrier rotatably supported on an input shaft driven eccentric, the carrier having a generally circular array of longitudinal pins mounted thereon such that the pins project from the carrier for intermittent engagement with the gear means; and a reaction plate fixed to the housing structure of the device and having a plurality of "open mouthed" openings for intermittent engagement with the pins; and where the reaction plate and the carrier being constructed and disposed relative to each other such that relative gyratory movement transverse to the pin axes causes the pins and gear means to engage and disengage to cause relative rotation of the gear means.
Thus the device may include an input shaft and eccentric on which a carrier element is located. The carrier may be provided with a single circular array of holes into which respective pins are fixed or journalled such that the longitudinal axes of the pins remain fixed relative to the carrier.
Each pin may protrude from its hole on one side of the carrier, and may be fitted with a suitable plain roller bearing if required.
A reaction plate is provided in which an array of "open mouthed" openings are located, the number of openings being equal to the number of pins. The size of the openings may be equal to the sum of the pin diameter and twice the eccentricity of the eccentric member, but this form may be varied to allow for relief from radial loads. Thereby, each pin is only in contact intermittently with its respective "open mouthed" opening during the operational cycle, and where at other times, it is completely disengaged with its respective opening.
The shape of the openings is preferably such to allow the protruding end of the pin to move in an circular orbit about the opening, thereby driving over an arc of 180 degrees at most and causing the gyratory motion of the carrier during rotation of the eccentric.
In order to transfer the motion from the gyrating carrier to an output, a geared member is provided on the output shaft of the device. The geared member is provided with teeth on its circumference and where the number of teeth are one less in number than there are pins in the carrier. Between adjacent teeth, a profile of partial semi-circular shape maybe provided, and the pins operate against these profiles for the transmission of power from the gyrating carrier to the geared member.
The axes of the pins is fixed with respect to the carrier, and where the reaction plate and carrier are disposed relative to each other such that relative gyratory movement of the carrier transverse to the pin axes causes the pins to engage and disengage with the reaction plate such as to cause relative rotation of the geared member on the output shaft. This occurs because of the gyratory motion of the carrier causes the pins to become sequentially engaged to the profiles provided between the teeth on the geared member. By just considering a single pin during one full rotation of the input shaft, the pin becomes engaged with a profile and acts to index or displace the geared member by an amount equal to one tooth spacing. As however in practice there are several pins engaged with the geared member at any one time, the force required to displace the geared member is shared by several pins.
While a proportion of the pins become disengaged from the geared member, they start to gradually commence engagement with their respective openings in the reaction plate. In contrast, those pins positioned approximately 180 degrees to the other side of the carrier, become disengaged from the reaction plate and commence gradual engagement with the geared member.
Preferab
REFERENCES:
patent: 4117746 (1978-10-01), Pierrat
patent: 4526064 (1985-07-01), Carden et al.
patent: 4621543 (1986-11-01), Gabilondo
Plumettaz SA
Ta Khoi Q.
Unipat AG
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